Question

if 3 : 6 : : 5 : a, then the value of a is
(a) 30
(b) 10
(c) 15​

Answer 1

Answer:

a = 10

Step-by-step explanation:

3 : 6 : : 5 : a

=> 3/6 = 5/a

=> 3a = 30 (by cross-multiplication)

=> a = 30/3

=> a = 10

Hope you understood!!

Answer 2

In context to question asked,

We have to determine the value of "a"

As per question,

it is given that,

$3:6 ::5:a$

In such question,

The logic by which the first two numbers are written will remain same for last two numbers.

So, logic between 3 and 6 is that, second number i.e. 6 is double to first number i.e. 3.

So, the value of "a" will be double to 5

Hence, value of "a" will be $5\times 2 = 10$